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Significant Accounting Policies - Impact of the Adoption of ASC 606 on consolidated Statement of Operations (Table) (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Condensed Statement of Income Captions [Line Items] |  |
Voyage revenues | $ 253,661 | $ 143,471
Voyage expenses | 42,586 | 31,649
Charter-in hire expenses | 40,763 | 1,736
Net income/ (loss) | $ 20,628 | $ (26,229)
Earnings/(Loss) per share, basic | $ 0.32 | $ (0.42)
Earnings/(Loss) per share, diluted | $ 0.32 | $ (0.42)
Balances without Adoption of ASC 606 |  |
Condensed Statement of Income Captions [Line Items] |  |
Voyage revenues | $ 253,922 |
Voyage expenses | 42,722 |
Charter-in hire expenses | 42,173 |
Net income/ (loss) | $ 19,343 |
Earnings/(Loss) per share, basic | $ 0.3 |
Earnings/(Loss) per share, diluted | $ 0.3 |
Effect of Adoption of ASC 606 |  |
Condensed Statement of Income Captions [Line Items] |  |
Voyage revenues | $ (261) |
Voyage expenses | 136 |
Charter-in hire expenses | 1,410 |
Net income/ (loss) | $ 1,285 |
Earnings/(Loss) per share, basic | $ 0.02 |
Earnings/(Loss) per share, diluted | $ 0.02 |

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